BlenderKit: show logout button in profile panel.

blenderkit/ui_panels.py

@@ -554,6 +554,9 @@ def draw_login_buttons(layout):
         layout.operator("wm.blenderkit_login", text="Sign up",
                         icon='URL').signup = True
 
+    if user_preferences.api_key != '':
+        layout.operator("wm.blenderkit_logout", text="Logout",
+                icon='URL')
 
 class VIEW3D_PT_blenderkit_unified(Panel):
     bl_category = "BlenderKit"